photosystems Photosynthesis occurs in 3 main stages: energy is captured from sunlight, thus it’s converted into chemical energy and stored in organic molecules. Photosystems be light harvesting units of the thylakoid tissue layer. Each photosystem has four hundred make up molecules. A photon hits the pigment molecules and travels through each molecule and so reaches the reaction center as shown in figure 1-1. The thylakoid membrane has two photosystems, photosystem 1 & 2. The reaction center in photosystem 1 is called P700 because this pigment is best at absorb 700 mm light.
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Photosystem 2’s reaction center is called P680 because it is best at enthralling 680 mm light. Calvin Cycle The Calvin cycle begins by incorporating Co2 from the air into molecules in the chloroplast. This action is called carbon fixation. The next thing it does is scoop up electrons to the fixed carbon to make it carbohydrate. The power of the Calvin cycle comes from NADPH. The ...
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